springmvc-3-拦截器

package interceptor;
import java.util.Date;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
 
public class IndexInterceptor extends HandlerInterceptorAdapter { 
 
     /** 
     * 在业务处理器处理请求之前被调用 
     * 如果返回false 
     *     从当前的拦截器往回执行所有拦截器的afterCompletion(),再退出拦截器链
     * 如果返回true 
     *    执行下一个拦截器,直到所有的拦截器都执行完毕 
     *    再执行被拦截的Controller 
     *    然后进入拦截器链, 
     *    从最后一个拦截器往回执行所有的postHandle() 
     *    接着再从最后一个拦截器往回执行所有的afterCompletion() 
     */   
    public boolean preHandle(HttpServletRequest request,   
            HttpServletResponse response, Object handler) throws Exception {
         
        System.out.println("preHandle(), 在访问Controller之前被调用"); 
        return true;
         
    } 
 
    /**
     * 在业务处理器处理请求执行完成后,生成视图之前执行的动作   
     * 可在modelAndView中加入数据，比如当前时间
     */ 
     
    public void postHandle(HttpServletRequest request,   
            HttpServletResponse response, Object handler,   
            ModelAndView modelAndView) throws Exception { 
        System.out.println("postHandle(), 在访问Controller之后，访问视图之前被调用,这里可以注入一个时间到modelAndView中，用于后续视图显示");
        modelAndView.addObject("date","由拦截器生成的时间:" + new Date());
    } 
 
    /** 
     * 在DispatcherServlet完全处理完请求后被调用,可用于清理资源等  
     *  
     * 当有拦截器抛出异常时,会从当前拦截器往回执行所有的拦截器的afterCompletion() 
     */
     
    public void afterCompletion(HttpServletRequest request,   
            HttpServletResponse response, Object handler, Exception ex) 
    throws Exception { 
           
        System.out.println("afterCompletion(), 在访问视图之后被调用"); 
    } 
       
}

配置拦截器

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/context        
    http://www.springframework.org/schema/context/spring-context-3.0.xsd">
     
    <context:component-scan base-package="controller" />
    <bean id="irViewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/page/" />
        <property name="suffix" value=".jsp" />
    </bean>
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>
    

<mvc:interceptors>   
        <mvc:interceptor>   
            <mvc:mapping path="/index"/> 
            <!-- 定义在mvc:interceptor下面的表示是对特定的请求才进行拦截的 --> 
            <bean class="interceptor.IndexInterceptor"/>     
        </mvc:interceptor> 
        <!-- 当设置多个拦截器时，先按顺序调用preHandle方法，然后逆序调用每个拦截器的postHandle和afterCompletion方法 --> 
    </mvc:interceptors>

</beans>

spring mvc中设置登录拦截器，报错：元素 "mvc:interceptors" 的前缀 "mvc" 未绑定。

原因：忘了加 xmlns:mvc="http://www.springframework.org/schema/mvc"

通配符的匹配很全面, 但无法找到元素 'mvc:interceptors' 的声明

http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

完整版springmvc配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc" 
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/context        
    http://www.springframework.org/schema/context/spring-context-3.0.xsd
     http://www.springframework.org/schema/mvc 
     http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

    <context:component-scan base-package="controller" />
    <bean id="irViewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/page/" />
        <property name="suffix" value=".jsp" />
    </bean>
    <bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver" />


    <!-- <bean id="simpleUrlHandlerMapping" -->
    <!-- class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> -->
    <!-- <property name="mappings"> -->
    <!-- <props> -->
    <!-- <prop key="/index">indexController</prop> -->
    <!-- </props> -->
    <!-- </property> -->
    <!-- </bean> -->
    <!-- <bean id="indexController" class="controller.IndexController"></bean> -->
    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/index" />
            <!-- 定义在mvc:interceptor下面的表示是对特定的请求才进行拦截的 -->
            <bean class="interceptor.IndexInterceptor" />
        </mvc:interceptor>
        <!-- 当设置多个拦截器时，先按顺序调用preHandle方法，然后逆序调用每个拦截器的postHandle和afterCompletion方法 -->
    </mvc:interceptors>
</beans>

转载于:https://www.cnblogs.com/czy16/p/9124797.html